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//
// Utility to patch the character generator file to create
// font for MEGA65 native mode and possibly other uses
//
#include "common.h"
#include <unistd.h>
#include <fstream>
#include <vector>
//
// Command line settings
//
std::string CMD_inFile = "chargen.rom";
std::string CMD_outFile = "chargen-native.rom";
std::string CMD_name = "CHARGEN";
//
// Common helper functions
//
void printUsage()
{
std::cout << "\n" <<
"usage: patch_chargen [-i <in file>] [-o <out file>] [-n name]" << "\n\n";
}
void printBanner()
{
printBannerLineTop();
std::cout << "// Generating patched font '" << CMD_name << "'" << "\n";
printBannerLineBottom();
}
//
// Top-level functions
//
void parseCommandLine(int argc, char **argv)
{
int opt;
// Retrieve command line options
while ((opt = getopt(argc, argv, "i:o:n:")) != -1)
{
switch(opt)
{
case 'i': CMD_inFile = optarg; break;
case 'o': CMD_outFile = optarg; break;
case 'n': CMD_name = optarg; break;
default: printUsage(); ERROR();
}
}
}
//
// Font processing
//
void processFont()
{
std::vector<uint8_t> fileContent;
// Read the source file
std::ifstream srcFile;
srcFile.open(CMD_inFile, std::ios::in | std::ios::binary | std::ios::ate);
if (!srcFile.good()) ERROR(std::string("unable to open ROM file '") + CMD_inFile + "'");
auto srcSize = srcFile.tellg();
if (srcSize != 4096) ERROR(std::string("incorrect size of ROM file '") + CMD_inFile + "'");
std::vector<uint8_t> srcFileContent;
fileContent.resize(srcSize);
srcFile.seekg (0, srcFile.beg);
srcFile.read((char *) fileContent.data(), fileContent.size());
if (!srcFile.good()) ERROR(std::string("unable to read ROM file '") + CMD_inFile + "'");
srcFile.close();
// Patch the font
for (uint8_t idx = 0; idx < 8; idx++)
{
// VENDOR + M - 2px width on C64
fileContent[0x67 * 8 + 0 + idx] = 0b00000001; // normal
fileContent[0x67 * 8 + 2048 + idx] = 0b00000001; // upper/lower case
fileContent[0xE7 * 8 + 0 + idx] = 0b11111110; // inversed
fileContent[0xE7 * 8 + 2048 + idx] = 0b11111110; // upper/lower case, inversed
// VENDOR + G - 2px width on C64
fileContent[0x65 * 8 + 0 + idx] = 0b10000000; // normal
fileContent[0x65 * 8 + 2048 + idx] = 0b10000000; // upper/lower case
fileContent[0xE5 * 8 + 0 + idx] = 0b01111111; // inversed
fileContent[0xE5 * 8 + 2048 + idx] = 0b01111111; // upper/lower case, inversed
// PI character restoration for upper/lower case set
fileContent[0x5E * 8 + 2048 + idx] = fileContent[0x5E * 8 + idx];
fileContent[0xDE * 8 + 2048 + idx] = fileContent[0xDE * 8 + idx];
}
// Remove old file
unlink(CMD_outFile.c_str());
// Save the patched font
std::ofstream outFile(CMD_outFile, std::fstream::out | std::ios::binary | std::fstream::trunc);
if (!outFile.good()) ERROR(std::string("can't open oputput file '") + CMD_outFile + "'");
outFile.write((const char*) fileContent.data(), fileContent.size());
if (!outFile.good())
{
outFile.close();
unlink(CMD_outFile.c_str());
ERROR(std::string("can't write oputput file '") + CMD_outFile + "'");
}
outFile.close();
}
//
// Main function
//
int main(int argc, char **argv)
{
parseCommandLine(argc, argv);
printBanner();
processFont();
return 0;
}
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